Penicillium

Penicillium, genus of blue or green moldfungi (kingdom Fungi) that exists as asexual forms (anamorphs, or deuteromycetes). Those species for which the sexual phase is known are placed in the Eurotiales. Found on foodstuffs, leather, and fabrics, they are of economic importance in the production of antibiotics (penicillin, q.v.), organic acids, and cheeses.

Penicillium notatum, the source of penicillin.Carlo Bevilacqua—SCALA/Art Resource, New York